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    Rg

    Roentgenium

    Transition Metal

    Atomic Number: 111 • Atomic Mass: 282.0000 u • Period: 7 • Group: 11

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁹
    Phase: Solid
    Electronegativity: 1.9
    Darmstadtium (Ds)Copernicium (Cn)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Roentgenium has been known since ancient times

    Historical Timeline

    Created in laboratory

    Formally named in 2004